Call up someone and pretend to work for Baskin-Robbins Ice Cream using your best radio DJ voice and say,

"Hi, I'm calling from Baskin-Robbins Ice Cream and if you can name 31 ice cream flavors in the next 31 seconds, we will pay you $31.00! Are you ready? ... Go!"

[wait a few seconds]

"Oh I am sorry, you are out of time!"

Then hang up the phone.

Chances are your caller will sputter and desperately try to name one or even two flavors.

Remember, many people have caller ID and have last number recall, so if you want to be anonymous, remember to block the call before you dial.